JP2000106722A - Controller for lifting and lowering in transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple connecting structure for an engine control lever to a sensitivity regulating lever and the side of a float in a controller for the lifting and lowering of a transplanter. SOLUTION: This controller for lifting and lowering in a transplanter is obtained by directly connecting a control wire 73 operated by an engine control lever 74 for regulating the number of revolutions of an engine 6 through a connecting tool 25 to a float wire 71 for freely shakably setting the posture of a ground contact float 14 freely vertically movably supported on a transplanting working machine 10 and making the connecting tool 25 permit the operation of the float wire 71 within a prescribed range relatively to a prescribed position of a sensitivity regulating lever 50 for regulating the sensitivity of control for lifting and lowering of the transplanting working machine 10 based on the vertical motion of the ground contact float 14 according to the soil pressure of a field and slide in the operating directions of both the wires 71 and 73 by shaking operations of the sensitivity regulating lever 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting and lowering control device for a transplanting machine which automatically controls the lifting and lowering of a transplanting work machine by a vertical movement according to an earth pressure received from a field of a ground float.

[Prior art]

2. Description of the Related Art A transplanting machine such as a riding rice transplanter is provided with an elevating control lever which can be operated to a manual position and an automatic position. There is also known a structure in which the working machine is automatically moved up and down by hydraulic pressure so as to be at a proper planting position by sensing the earth pressure acting on the float of the working machine.

[0003] However, when the mud in the field scene is soft, the front part of the float generally falls down and gets into the mud, causing the working machine to sink and the planting depth becomes too deep. If the mud is hard,
There is a drawback that the front part of the float rises, so that the working machine rises and the planting depth becomes shallow, and frequent vertical swings occur due to earthen lumps and the like.

To solve this problem, for example, by changing the sensing point of the earth pressure acting on the float, if the mud is soft, the sensing point is lowered and the earth pressure is detected early, and if the mud is hard, the sensing is performed. Means for detecting the earth pressure with the point raised late (hereinafter, the former conventional example)
There is a known means for changing the float sensing load (hereinafter, the latter conventional example).

[0005] As the former conventional example, the float is forcibly changed in the vertical position to change the sliding posture of the float, and the float sensing point is changed up and down to correspond to the field conditions. As a conventional example of the latter, it is possible to control the vertical movement of the float with high sensitivity according to the hardness of the field scene, or to control the float by reducing the sensitivity, thereby changing the float's perceived load and responding Known to do so.

For example, as a conventional example of the latter, when the mud is soft, the tension of a spring for urging the float in the direction of the field is weakened so that the float can move upward even with a slight earth pressure, thereby providing sharp sensitivity. In the up and down movement of the float is controlled, and when the mud is hard, the tension of the spring is increased to increase the upward movement resistance of the float so that the float does not move unless the earth pressure is large. It is common to control the vertical movement of the float with low sensitivity.

[0007]

However, according to the former conventional example described above, the sensing point is changed by forcibly adjusting the front part of the float in accordance with the hardness of the field scene to change the sensing point. In the case of extremely soft mud, the float's front will sink and push the mud, even if the front of the float is lowered and the earth pressure is sensed as soon as possible. However, there was a risk that it would go underground more and more.

According to the latter conventional example, a spring for urging the float in the field direction is arranged near the float, the urging force of the spring is connected to the float via a link mechanism, and the spring is operated by operating an adjustment lever. Since the tension of the spring is changed, the number of parts increases and the structure becomes complicated.

[0009]

In order to solve the above-mentioned problems, a lifting and lowering control device for a transplanting machine according to the present invention is provided. The transplanting working machine 10 having a vertically movable floating float 14 can be moved up and down on a traveling machine body 5. And a sensitivity adjusting lever for automatically controlling the lifting and lowering of the transplanting machine 10 by a hydraulic cylinder 19 based on the vertical movement of the grounding float 14 according to the earth pressure in the field, and adjusting the sensitivity of the lifting and lowering control. 50 and an engine control lever 74 for adjusting the number of revolutions of the engine 6, wherein the hydraulic cylinder 19 is operated by a hydraulic pump driven by the rotation of the engine 6. 73 and a float wire 71 for setting the attitude of the ground float 14 to be swingable.
Is directly connected via the connecting tool 25, the connecting tool 25 allows the sensitivity adjustment lever 50 in a predetermined position to operate the float wire 71 within a predetermined range, and the sensitivity adjustment lever 50 swings. The first feature is that the structure is such that the wires 71 and 73 can be slid in the operation direction.

Further, a long hole 25c is formed in the connecting member 25 in the operation direction of the two wires 71 and 73, and the long hole 25c is formed.
A second feature is that a swinging end that can be moved in the longitudinal direction of the long hole 25c with the swinging of the sensitivity adjusting lever 50 is slidably inserted.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall side view of a riding rice transplanter to which the present invention is applied. The riding rice transplanter 1 is provided with a transplanting machine 10 behind a traveling machine body 5 supported by a front wheel 2 and a rear wheel 3.
(Hereinafter referred to as a working machine 10). The traveling machine body 5 has an engine 6 mounted at a front portion thereof and a seat 7 at a substantially intermediate position between the front and rear wheels 2, 3. A driver's seat 9 is provided.

The working machine 10 includes a large number of planting rods 1.
1, ground float 14, seedling mounting table 1 for placing mat seedlings
A link support frame 55 (see FIG. 2) at the rear end of the lift link mechanism 8 so as to be movable up and down by the lifting link mechanism 8 including an upper link 8a and a lower link 8b. ) Is supported in a freely rolling manner by a rolling shaft (not shown) installed at the center.

At this time, as shown in FIG. 2, a sensing plate 62 is rotatably supported and connected to a front portion of the ground float 14 via a connecting pin 62a, and the ground float 14 will be described later. As described above, the sensing plate 62 is connected to the working machine 10 via the swing arm 75, and the rear portion is rotatably mounted on the lower side of the transmission case so that the sensing plate 62 can be moved up and down on the lower part of the working machine 10. Mounted and supported.

On the other hand, a hydraulic cylinder 19 for operating (elevating) the elevating link mechanism 8 by expansion and contraction is provided between the transmission case 16 provided at the front portion of the traveling machine body 5 and the elevating link mechanism 8. There is driver's seat 9
A hydraulic control valve 35 composed of a rotary pool valve for controlling expansion and contraction of the hydraulic cylinder 19 is connected to the hydraulic cylinder 19 and disposed below the hydraulic cylinder 19. The hydraulic cylinder 19 is operated by the hydraulic control valve 35. It is configured as follows.

As shown in FIGS. 2 to 4, an operating arm 37 is mounted on a shaft 35a integral with the spool of the hydraulic control valve 35.
Is connected to the ground float 14 via a sensing link mechanism 15 having a configuration to be described later, whereby the sensing link mechanism 15 is moved up and down by the vertical movement of the ground float 14 based on the fluctuation of the earth pressure acting on the ground float 14 in the field. , The hydraulic control valve 35 is automatically controlled by operating the arm 37, and the working machine 10 is controlled by the hydraulic cylinder 19 to be automatically raised and lowered (oil pressure sensing control).

The ground float 14 (the sensing plate 6)
The above-mentioned swing arm 75 for supporting 2) is composed of bifurcated arms 75a and 75b, and has a center portion connected to a connection shaft 21 connected to the lower links 8b and 8b on the left and right sides of the body. 23, it is rotatably supported on a rotation fulcrum 60 as a center, and is attached to the work machine 10 (elevation link mechanism 8) side.

One arm 75a of the swing arm 75 is connected via a pin 72 to an elongated hole 62b formed in the sensing plate 62, and
A spring 76 is stretched between the connecting pin 2 and the connecting pin 62a. The swing arm 75 and the sensing plate 62 are connected via the spring 76, and the other arm 75b is connected to the sensing link. The front part of the grounding float 14 is connected to the work machine 10 side as described above.

A float wire 71 (outer) is fixed to the upper end of the sensing plate 62.
The inner wire 71a of the float wire 71 is fixed to the pin 72, thereby
Stretches the inner wire 71a and sets the working length of the sensing plate 62 which is the length between the pin 72 and the connecting pin 62a.
1 (inner wire 71a), the front part of the ground float 14 is forcibly changed in the vertical position, and the sliding posture of the ground float 14 is changed.

Next, the structure of the sensing link mechanism 15 will be described. The sensing link mechanism 15 includes the sensing rod 39, the continuous traction link 42, and the sensing rod 39 and the continuous traction link 4.
2 and a link ratio adjusting section 20 for connecting the arm 75b and the sensing rod 39 as described above.
And the other end of the continuous traction link 42 is connected to the arm 37, thereby connecting the ground float 14 and the hydraulic control valve 35 (arm 37).

The link 42 and the arm 37 are connected via a pin 43 projecting from the link 42, and the sensing rod 39 and the arm 75b are connected to a rod member constituting the sensing rod 39. The arm 75b is connected to a long hole 40b formed in the link fitting 40 through a link fitting 40 attached to a rear portion of the arm 75b.
A pin 32 fixed to the tip of the connector is fitted, and a spring 41 is stretched between the pin 32 and a pin 40a protruding from the link fitting 40, so that a biased connection is made. I have.

Further, the link ratio adjusting section 20 is constituted by an arm-shaped conversion lever 22 whose base end is rotatably mounted on the lower link 8b by a pivotal connection section 17 so as to be rotatable. Sensing rod 39 at tip of swing side
Pin joint 38 attached to the front of (rod member)
Are rotatably mounted via pins 27, and a plurality of holes 22a are formed along the longitudinal direction.
The link 42 is connected to any one of the
Has one end rotatably mounted.

On the other hand, a sensitivity adjusting lever 50 for adjusting the operating sensitivity of the hydraulic control valve 35 is provided in the driver's seat 9 described above.
Is provided so as to be swingable, and the sensitivity adjusting lever 5 is provided.
It is configured such that the sensitivity of the hydraulic control valve 35 can be adjusted by the swing of 0 as described below.

As shown in FIG. 5, the sensitivity adjusting lever 50 has a substantially L-shaped lever arm 50b fixed to the upper end of a substantially U-shaped bracket 50a whose lower end is rotatably supported at its open end. The inner wire 24a of the wire 24 (the outer is fixed to the traveling body 5 side) is fixed via a pin 50c provided at a bent portion of the lever arm 50b. A return spring 45 is provided between the other end of the inner wire 24a and a pin 44 protruding from an intermediate portion of the linking link 42.
Is stretched.

When the attitude of the ground float 14 is disturbed due to the condition of the field during the planting operation by the riding rice transplanter 1 with the structure shown above, for example, the work machine 10 rises with respect to the rice field and When the acting earth pressure decreases, the front of the ground float 14 is lowered, and this movement is applied to the swing arm 75a via the pin 72 positioned at a predetermined position of the sensing plate 62 and the elongated hole 62b in the counterclockwise direction in FIG. , And the swing arm 75b also rotates in the same direction via the pivot 60 to push the sensing rod 39 leftward in FIG.

As a result, the conversion lever 22 is rotated counterclockwise about the pivot connection 17, and the amount of rotation of the sensing rod 39 in the counterclockwise direction about the pivot connection 17 is continuously increased. Since the ratio of the amount of rotation of the link 42 to the same direction is R / r, the amount of rotation of the sensing rod 39 is r / R.
It is transmitted to the continuous traction link 42 as the amount of movement to the left in the drawing.

The movement of the continuous traction link 42 to the left in the drawing is transmitted to the arm 37 via the pin 43, and the operating shaft 35a of the hydraulic control valve 35 is rotated clockwise as shown in FIG. The control valve 35 is switched to discharge the oil in the hydraulic cylinder 19, the shilling device 19 contracts, the work machine 10 is lowered, and the posture of the ground float 14 is properly corrected.

When the work machine 10 is lowered and the ground float 1
If the earth pressure acting on the grounding float 4 increases,
Is lifted up, and the movement is caused to rotate the conversion lever 22 clockwise in FIG. 2 around the pivot joint 17 via the sensing plate 62, the swing arms 75a and 75b, and the sensing rod 39. The rotation of the conversion lever 22 causes the continuous traction link 42 to move rightward in FIG.

Thus, the operation of the continuous traction link 42 is
3 is transmitted to the arm 37 via the hydraulic control valve 35
2 is rotated in the counterclockwise direction in FIG. 2, the hydraulic control valve 35 is switched so as to pump the hydraulic oil to the hydraulic cylinder 19, and the rod of the hydraulic cylinder 19 is extended to properly adjust the working machine 10. The position of the ground float 14 is corrected appropriately, that is, the lifting and lowering of the work machine 10 is automatically controlled as described above.

However, the ground float 14 is constantly urged in the downward direction by the urging force of the return spring 45 via the continuous traction link 42 and the like (the sensing link mechanism 15). When a force exceeding the urging force acts on the side, the arm 37 is swung, the hydraulic control valve 35 is operated, and the lifting and lowering control of the work machine 10 is performed.

Since the urging force of the return spring 45 is changed by the swing of the sensitivity adjusting lever 50 by the above structure, the urging force (the hydraulic control valve) for operating the hydraulic control valve 35 by the swing operation of the sensitivity adjusting lever 50 is provided. 3
5), that is, the sensing sensitivity (sensing load) of the ground float 14 is changed.

The pin 46 can be freely inserted into and removed from the hole 22a of the link ratio adjusting section 20 by inserting and removing, so that the conversion lever 22 can be changed.
It is possible to change the ratio of the distance R between the pivot connection 17 and the pin 27 to the distance r between the pivot connection 17 and the pin 46.

As a result, the conversion lever 22 and the continuous traction link 4
2 (change R: r), the ratio of the load applied to the sensing rod 39 (the sensing load of the ground float 14) to the load transmitted to the continuous traction link 42 becomes r /
R, and when the biasing force of the return spring 45 is P, a load of P · r / R is transmitted to the sensing rod 39,
A load proportional to this load (P · r / R) acts in the downward direction of the ground float 14. That is, the link ratio adjusting unit 2
By changing the link ratio by 0 (changing R: r),
It is configured so that the ground float sensing sensitivity can be changed.

Further, by changing R: r, the amount of rotation of the sensing rod 39 about the pivot connection 17 (the ground float 14
The ratio between the amount of rotation of the sensing rod 39 (the amount of vertical movement of the ground float 14) and the amount of rotation of the continuous traction link 42 is R / R. r
The rotation amount of the sensing rod 39 is multiplied by r / R and transmitted to the continuous traction link 42, and the hydraulic control valve 35 is controlled by the changed movement amount changed to the predetermined ratio. It is configured such that the amount of operation of the hydraulic control valve 35 with respect to the amount of elevation can be adjusted.

On the other hand, the lever arm 50b of the sensitivity adjusting lever 50 swings around the pivot axis c of the bracket by swinging the sensitivity adjusting lever 50 to adjust and set the above-mentioned sensitivity. An L-shaped plate-shaped outer fixing member 30 is rotatably (swingably) supported at the base end portion of the outer fixing member 30.
An outer 73b of the control wire 73 is fixed to the control wire 73. One end of an inner wire 73a is connected to the control wire 73 on the side of an engine control lever 74 provided on the driver's seat 9 side to adjust the rotation speed of the engine 6 (running speed of the body).

The other end (the end on the side of the outer fixing member 30) of the inner wire 73a is connected to the open end of the connecting member 25 comprising a substantially U-shaped connecting plate 25a shown in FIG. The other end of the inner wire 71a of the above-mentioned float wire 71 is attached to the opposite side of the open end of the connecting member 25, and the side surface of the connecting member 25 (the connecting plate 25a) A long hole 25c elongated in the operating direction of both wires 71, 73
The base end E of the lever arm 50b is slidably inserted into the elongated hole 25c.

Thus, the engine control lever 7
4, the control wire 73 (the inner wire 73 a) is operated, and the connecting member 25 slides within the range of the elongated hole 25 c using the lever arm 50 b as a guide to move the float wire 71 (the inner wire 71 a).
Is operated directly to change the sliding posture of the landing float 14 as described above. That is, the sliding attitude of the ground float 14 is changed simultaneously with the adjustment of the rotation speed of the engine 6 by the engine control lever 74, and the point at which the earth pressure from the field at the ground float 14 is sensed by the sliding attitude change of the ground float 14 (sensing point) ) Is changed.

When the sensitivity adjusting lever 50 is rocked, the lever arm 50b is rocked and the outer fixing member 30 is moved, so that the connecting member 25 is moved with this movement, and the float wire 71 (inner wire) is moved. 71
a) is operated. That is, the swinging operation of the sensitivity adjusting lever 50 causes the connecting member 2 to move in the operating direction of the two wires 71 and 73.
5 is slid, and at the same time as the sensitivity of the landing float 14 is adjusted, the sliding posture (sensing point) of the landing float 14 is changed.

At this time, the connecting member 25 and the lever arm 50b (the base end portion E) are connected to the elongated hole 25c of the connecting member 25.
When the engine control lever 74 is operated while the sensitivity adjustment lever 50 is located at a predetermined position (the sensitivity of the ground float 14 is set to a predetermined value), the above-described operation is performed. The float wire 71 is controlled by the control wire 73 in the range of the long hole 25c.
Is operated, and the attitude of the ground float 14 is set to a sensitivity (sensing point) corresponding to a change in the rotation speed of the engine 6 while maintaining the sensitivity of the ground float 14 set by the sensitivity adjusting lever 50.

Thus, for example, on a relatively soft rice field, raising and lowering the working machine 10 can be performed well by increasing the sensing sensitivity of the ground float 14.
Set the sensitivity adjustment lever 50 to a predetermined position (predetermined sensitivity)
The vertical movement of the work implement 10 can be controlled by swinging the work float 10 in the direction of increasing the sensitivity, but at the same time, the sensing point of the ground float 14 is also adjusted (the ground float 1
4 is faster) and a more suitable work machine 10
Is controlled.

On the other hand, for example, on a relatively hard rice field, the sensitivity of the ground float 14 can be lowered to control the lifting and lowering of the working machine 10 properly. Therefore, the sensitivity adjusting lever 50 is moved to a predetermined position (a predetermined sensitivity). ) To lower the sensitivity to lower the sensitivity.
As described above, the sensing point of the grounding float 14 is also adjusted at the same time (the sensing point of the grounding float 14 is slowed down), and a more appropriate work machine 1 can be controlled.
0 elevation control is performed.

Further, when the engine control lever 74 changes the rotation speed (running speed of the body) of the engine 6 from the above state, the sensing point of the ground float 14 is changed in conjunction therewith (the sensing point is increased when the speed is increased). Is delayed and the sensing point becomes earlier when the vehicle is decelerated), so that the lifting and lowering control of the work machine 10 more appropriately corresponding to the field condition and the running condition of the machine is performed. The slot 25
“c” corresponds to the full stroke of the engine control lever 74.

At this time, the float wire 71 is directly operated via the connecting member 25 by operating the control wire 73, so that the lifting and lowering control of the work machine 10 can be properly performed with a simpler structure, and the float wire 71 can be adjusted. 71 is performed more stably, and the connecting member 2
Since the sensitivity adjustment lever 50 side and the engine control lever 74 side are connected through the 5 (elongated hole 25c), the connection structure is simpler.

When the connecting member 25 is moved by the swing of the sensitivity adjusting lever 50, the outer fixing member 30 is moved.
Is moved along the swing locus of the lever arm 50b, the connecting member 25 is also moved along the swing locus of the lever arm 50b, and the inner wire 73a of the control wire 73 is swung.

However, since the outer fixing member 30 is swingably supported with respect to the lever arm 50b, the outer fixing member 30 swings, and when the control wire 73 is operated (when the engine control lever is swung). The inner wire 73a and the outer receiver are positioned substantially in a straight line, and the control wire 73 operates the float wire 71 in a substantially straight line in accordance with the posture of the float wire 71.

As a result, the operation load of the float wire 71 (engine control lever 74) does not become unnecessarily large, and the float wire 71 can be smoothly operated. Since it is supported by the arm 50b, the structure of the receiving portion of the outer can be simplified, and the outer portion can be configured with a larger size.

When the vertical movement amount of the ground float 14 is constant, the link ratio adjusting unit 20 is adjusted to provide the hydraulic control valve 35 with a ratio of R: r to the vertical movement amount of the ground float 14. The movement amount is transmitted according to
Thereby, the displacement amount of the hydraulic control valve 35 with respect to the vertical movement of the ground float 14 by a predetermined amount is set, and the operation dead zone of the ground float 14 is changed.

As a result, the operation dead band is increased on a soft rice field, the hunting of the hydraulic control valve 35 is prevented without reacting to slight irregularities on the rice field, and the operation dead band is reduced on a hard rice field. The ground pressure of the ground float 14 is increased so that small irregularities can be leveled by the ground pressure of the ground float 14.

[0048]

According to the structure of the present invention configured as described above, when the sensitivity adjusting lever is located at the predetermined position, the sensitivity of the elevation control set by the sensitivity adjusting lever is not affected. By operating the engine control lever, the float attitude is directly changed via the control wire and the float wire, the float attitude is set to the sensitivity corresponding to the change in engine rotation, and stable high-precision automatic elevating control can be performed. However, at this time, the engine control lever and the float side are directly connected via the connecting tool, and the connecting tool has a structure linked to the sensitivity adjusting lever. This has the effect of simplifying the connection structure with the float side.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a side view of a main part of the elevation control device.

FIG. 3 is a side view of a main part of a sensitivity adjustment lever portion.

FIG. 4 is a plan view of a main part of a sensitivity adjustment lever portion.

FIGS. 5A and 5B are a side view and a front view of a sensitivity adjusting lever.

FIG. 6 shows a front view of a connecting member portion.

[Explanation of symbols]

 Reference Signs List 5 traveling body 6 engine 10 transplanting work machine 14 ground float 19 hydraulic cylinder 25 connecting member (connecting tool) 25c long hole 50 sensitivity adjustment lever 71 float wire 73 control wire 74 engine control lever

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2B062 AA08 AA09 AA14 AB01 BA01 BA20 BA24 BA62 CA06 CA12 2B063 AA14 AB01 AB08 BB08 BB13 CB11 2B304 KA13 LA09 LB05 LB16 LC04 MA03 MB02 MC08 PA01 PA11 PC01 PC08 PD02 RA28 QA22 Q27

Claims (2)

[Claims] 1. A transplanting machine (10) provided with a grounding float (14) which is vertically movable and connected to a traveling body (5) so as to be able to move up and down, according to the earth pressure of the grounding float (14) in the field. The transplanting machine (10) is automatically moved up and down by a hydraulic cylinder (19) based on the vertical movement.
A sensitivity adjusting lever (50) for adjusting the sensitivity of the elevation control and an engine control lever (74) for adjusting the rotation speed of the engine (6) are provided, and the hydraulic cylinder (19) is driven by the rotation of the engine (6). In a transplanter operated by a hydraulic pump, a control wire (73) operated by the engine control lever (74) and a float wire (71) for swingably setting a posture of a ground float (14) are connected. Tools (25)
The connector (25) allows the sensitivity adjustment lever (50) at a predetermined position to operate the float wire (71) within a predetermined range, and swings the sensitivity adjustment lever (50). The two wires (71),
(73) An elevation control device for a transplanter having a structure slidable in the operation direction. 2. The connecting tool (25) has two wires (71),
A long hole (25c) is drilled in the operation direction of (73), and the long hole (25c) is formed in the long hole (25c) in accordance with the swing of the sensitivity adjustment lever (50). 2. The elevation control device in the transplanter according to claim 1, wherein the movable swinging end is slidably inserted.